Alexa Mihai's Comments

The competition itself at the Neuchâtel link observatory ended after 1967, but the chronometer testing and certification practice continued. In 1968, Seiko submitted 100 link units of Cal. 4520 (Seiko's first manual link 10-beat/hi-beat movement) for chronometry certification, and 73 of them passed the test. In the following two years, an additional 153 movements passed the test, bringing the total count of certified chronometer movements to 226.
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